The envoys are expected to bring back an exact date for the third inter-Korean summit, as well as engaging in broad discussions based on agreements made with the United States during the Singapore summit earlier this year.

South Koreas presidential office

Chung Eui-yong, top national security adviser hand-delivered South Korean president's letter to Kim Jong Un as a special envoy to Pyongyang, North Korea, Sept. 5, 2018.

“There will be discussions on the specific schedule and agenda of the inter-Korean summit meeting in Pyongyang during September,” Chung said in a press briefing Tuesday, the night before the trip.

Chung added, “we will consult on various measures to advance the development of inter-Korean relations through the implementation of the Panmunjom Declaration,” which the Koreas adopted earlier this year with the goal of ending their conflict.

Yonhap via Reuters

South Korean special envoys led by the chief of the national security office at Seoul'?s presidential Blue House, Chung Eui-yong, leave for Pyongyang from an airport in Sungnam city, South Korea, Sept. 5, 2018.

The five-member special delegation is expected to leave Pyongyang after the dinner banquet prepared by the North. It was unknown whether Kim Jong Un will host the dinner banquet, the presidential office said.

Yonhap via Reuters

South Korean special envoys led by the chief of the national security office at Seoul's presidential Blue House, Chung Eui-yong, leave for Pyongyang from an airport in Sungnam city, South Korea, Sept. 5, 2018.

The delegation included the same officials from the first envoys to Pyongyang in March: Chief of National Intelligence Suh Hoon, Vice Unification Minister Chun Hae-Sung, the presidential secretary for state affairs, Yun Kun-young, and senior National Intelligence Service official Kim Sang-gyun.

Jung Yeon-Je/Pool/Getty Images

Chung Eui-yong (3rd R), head of the presidential National Security Office, and other delegaters pose before boarding an aircraft as they leave for Pyongyang at a military airport, Sept. 5, 2018, in Seounfnam, South Korea.